One-Timer

What is One-Timer?

The one-timer is a type of hockey shot achieved between two
players on the same team. The player carrying the puck passes the
puck to the second player who immediately shoots the puck without
attempting to control the puck first. This shot requires a very
precise pass and excellent timing on the shooter's part.

Sporting Charts explains One-Timer

The one-timer is often used in an odd man advantage situation
where the puck carrier draws the defenseman toward him, then
quickly passes the puck to his teammate who immediately shoots the
puck. This does not give the goaltender much time to reposition to
block the shot coming from a different angle, so it can often
result in a goal. The one-timer is an effective shot if executed
correctly. It is especially effective if there is a greater change
in direction and angle of the puck from what the goaltender is
expecting, and if the shot on the one-timer results in a fast
moving puck. The faster the puck moves and the greater the change
in expected angle, the greater the chance the attacking team will
score.